Submission #470577

#TimeUsernameProblemLanguageResultExecution timeMemory
470577Return_0Port Facility (JOI17_port_facility)C++17
100 / 100
2138 ms168652 KiB
#pragma GCC optimize("Ofast,unroll-loops") // #pragma comment(linker, "/stack:200000000") // #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma,tune=native") #include <bits/stdc++.h> #include <ext/pb_ds/assoc_container.hpp> #include <ext/pb_ds/tree_policy.hpp> using namespace std; using namespace __gnu_pbds; typedef int ll; typedef long double ld; typedef pair <ll, ll> pll; #ifdef SINA #define dbg(...) __f(#__VA_ARGS__, __VA_ARGS__) template <typename Arg1> void __f(const char* name, Arg1&& arg1) { cout << name << " : " << arg1 << std::endl; } template <typename Arg1, typename... Args> void __f (const char* names, Arg1&& arg1, Args&&... args) { const char* comma = strchr(names + 1, ',');cout.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...); } #define dbg2(x, j, n) cout<< #x << " : "; output((j), (n), x, 1); cout.flush(); #else #define dbg(...) 0 #define dbg2(x, j, n) 0 #endif #define SZ(x) ((ll)((x).size())) #define File(s, t) freopen(s ".txt", "r", stdin); freopen(t ".txt", "w", stdout); #define input(j, n, a) for (int _i = (j); _i < (n)+(j); _i++) cin>> a[_i]; #define output(j, n, a, t) for (int _i = (j); _i < (n)+(j); _i++) cout<< a[_i] << (((t) && _i != (n)+(j)-1)? ' ' : '\n'); #define kill(x) return cout<< (x) << endl, 0 #define cl const ll #define fr first #define sc second #define lc (v << 1) #define rc (lc | 1) #define mid ((l + r) >> 1) #define All(x) (x).begin(), (x).end() cl inf = sizeof(ll) == 4 ? (1e9 + 10) : (3e18), mod = 1e9 + 7, MOD = 998244353; template <class A,class B> ostream& operator << (ostream& out,const pair<A,B>&a){return out<<'('<<a.first<<", "<<a.second<<')';} template <class A> ostream& operator << (ostream& out, const vector<A> &a) { out<< '['; for (int i = -1; ++i < int(a.size());) out<< a[i] << (i + 1 < int(a.size()) ? ", " : ""); return out<<']'; } template <class T, typename _t = less <T> > using Tree = tree <T, null_type, _t, rb_tree_tag, tree_order_statistics_node_update>; cl N = 1e6 + 7; ll A [N], B [N], arr [N << 1], n, ans; vector <ll> vec [2]; bool mark [N]; set <ll> st; struct segtree { ll mx [N << 2], mn [N << 2], n; segtree () { memset(mx, -63, sizeof mx); memset(mn, 63, sizeof mn); } inline void updmx (ll pos, cl &x) { for (mx[pos += n] = x; pos > 1; pos >>= 1) mx[pos >> 1] = max(mx[pos], mx[pos ^ 1]); } inline void updmn (ll pos, cl &x) { for (mn[pos += n] = x; pos > 1; pos >>= 1) mn[pos >> 1] = min(mn[pos], mn[pos ^ 1]); } inline ll askmx (ll l, ll r) { ll ret = -1; for (l += n, r += n; l < r; l >>= 1, r >>= 1) { if (l & 1) ret = max(ret, mx[l++]); if (r & 1) ret = max(ret, mx[--r]); } return ret; } inline ll askmn (ll l, ll r) { ll ret = inf; for (l += n, r += n; l < r; l >>= 1, r >>= 1) { if (l & 1) ret = min(ret, mn[l++]); if (r & 1) ret = min(ret, mn[--r]); } return ret; } } seg; void dfs (cl &v, cl &col = 0) { mark[v] = 1; seg.updmx(A[v], -1); seg.updmn(B[v], inf); vec[col].push_back(v); for (ll u;;) { u = seg.askmx(A[v], B[v]); if (u < B[v]) break; u = arr[u] - n; dfs(u, col ^ 1); } for (ll u;;) { u = seg.askmn(A[v], B[v]); if (u > A[v]) break; u = arr[u]; dfs(u, col ^ 1); } } bool check (vector <ll> &v) { st.clear(); sort(All(v), [&](cl &x, cl &y) { return A[x] < A[y]; }); for (auto &x : v) { if (st.lower_bound(A[x]) != st.lower_bound(B[x])) return false; st.insert(B[x]); } return true; } int main () { cin.tie(0)->sync_with_stdio(false); cin>> n; seg.n = n + n; for (ll i = 0; i < n; i++) { cin>> A[i] >> B[i], arr[--A[i]] = i, arr[--B[i]] = i + n; seg.updmx(A[i], B[i]); seg.updmn(B[i], A[i]); } for (ll i = 0; i < n + n; i++) if (arr[i] < n && !mark[arr[i]]) ans++, dfs(arr[i]); if (!check(vec[0])) kill(0); if (!check(vec[1])) kill(0); for (n = ans, ans = 1; n--;) (ans <<= 1) %= mod; cout<< ans << endl; cerr<< "\n" __TIMESTAMP__ " - Time elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << "ms\n"; return 0; } /* 4 1 3 2 5 4 8 6 7 */
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